GH-101100: Resolve reference warnings in extending/extending.rst (GH-138417)

(cherry picked from commit 8cf547f)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

Author: AA-Turner

Doc/extending/extending.rst

@@ -401,7 +401,7 @@ A pointer to the module definition must be returned via :c:func:`PyModuleDef_Ini
 so that the import machinery can create the module and store it in ``sys.modules``.
 
 When embedding Python, the :c:func:`!PyInit_spam` function is not called
-automatically unless there's an entry in the :c:data:`PyImport_Inittab` table.
+automatically unless there's an entry in the :c:data:`!PyImport_Inittab` table.
 To add the module to the initialization table, use :c:func:`PyImport_AppendInittab`,
 optionally followed by an import of the module::
 

Doc/tools/.nitignore

@@ -11,7 +11,6 @@ Doc/c-api/module.rst
 Doc/c-api/stable.rst
 Doc/c-api/type.rst
 Doc/c-api/typeobj.rst
-Doc/extending/extending.rst
 Doc/library/ast.rst
 Doc/library/asyncio-extending.rst
 Doc/library/email.charset.rst

Misc/NEWS.d/3.11.0a1.rst

@@ -4931,7 +4931,7 @@ Patch by Gabriele N. Tornetta
 .. nonce: 3p14JB
 .. section: C API
 
-:c:func:`Py_RunMain` now resets :c:data:`PyImport_Inittab` to its initial
+:c:func:`Py_RunMain` now resets :c:data:`!PyImport_Inittab` to its initial
 value at exit. It must be possible to call :c:func:`PyImport_AppendInittab`
 or :c:func:`PyImport_ExtendInittab` at each Python initialization. Patch by
 Victor Stinner.